Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantas vezes o mens u20 foi registrado quando as Womens 40 foram Sydney Scorpions def North Queensland Cyclones?
 ###Tabelas: CREATE TABLE results_by_year (results_by_year_id AUTO_INCREMENT PRIMARY KEY, Year INT, Mens Open VARCHAR, Womens Open VARCHAR, Mixed Open VARCHAR, Mens u20 VARCHAR, Womens u20 VARCHAR, Senior Mixed VARCHAR, Mens 30 VARCHAR, Womens 30 VARCHAR, Mens 35 VARCHAR, Womens 35 VARCHAR, Mens 40 VARCHAR, Womens 40 VARCHAR, Mens 45 VARCHAR, Mens 50 VARCHAR) CREATE TABLE per_capita_gdp (per_capita_gdp_id AUTO_INCREMENT PRIMARY KEY, Economy VARCHAR, 1980 INT, Gap from Thailand as of 1980 (times) VARCHAR, 1985 INT, 1990 INT, 1995 INT, 2000 INT, 2005 INT, 2010 INT, 2012 INT, Gap from Thailand as of 2012 (times) VARCHAR, GDP as of 2012 after purchasing power parity (PPP) calculations (USD billions) VARCHAR, GDP per capita as of 2012 (PPP) INT) CREATE TABLE singles_2–3 (singles_2–3_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Surface VARCHAR, Opponent VARCHAR, Score VARCHAR) CREATE TABLE performances_by_clubs (performances_by_clubs_id AUTO_INCREMENT PRIMARY KEY, # INT, Nation VARCHAR, Winners INT, Runners-up INT, 3rd Place INT, 4th Place INT) CREATE TABLE championship_drivers_and_constructors (championship_drivers_and_constructors_id AUTO_INCREMENT PRIMARY KEY, Entrant VARCHAR, Constructor VARCHAR, Chassis VARCHAR, Engine VARCHAR, Tyre VARCHAR, Driver VARCHAR, Rounds VARCHAR)  
SELECT COUNT Mens u20 FROM results_by_year WHERE Womens 40 = Sydney Scorpions def North Queensland Cyclones